A New Principle for a High Efficiency Power Audio Amplifier for Use with a Digital Preamplifier

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The use of class-B and class-D amlifiers for converting digital audio signals to analog signals is discussed. It is shown that the class-D amplifier is unsuitable due to distortion. Therefore, a new principle involving a switch-mode power supply and a class-B amplifier is suggested. By regulating the supply voltage to the amplifier according to the amplitude of the audio signal, a higher efficiency than can be obtained by the current principles is achieved. The regulation can be done very efficiently by generating the control signal to the power supply in advance of the audio signal, made possible by the digital signal from the preamplifier. A prototype shows possibilities for further developments.
Original languageEnglish
Title of host publicationAudio Engineering Society Preprint : Presented at the 80th Convention
PublisherAudio Engineering Society
Publication date1986
Publication statusPublished - 1986
EventAES Convention - Montreux, Switzerland
Duration: 4 Mar 19867 Mar 1986
Conference number: 80


ConferenceAES Convention

Bibliographical note

Paper Number:2346


  • Amplifiers
  • Audio frequency
  • Amplifiers, power type
  • Electronic circuits
  • Power supply - applications
  • Audio equipment
  • Data conversion, digital to analog
  • High efficiency power audio amplifier
  • Digital preamplifier
  • Control of power supply
  • Conversion from digital to analog signal;
  • Switch-mode power supply

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